Elimination of switching losses in the single active bridge over a wide voltage and load range at constant frequency

Ting, Yeh; Haan, Sjoerd de; Ferreira, J.A.

doi:10.1109/epe.2013.6634627

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…The switching frequency (F s ) must be selected higher than 20 kHz to reduce noise in the audible range. Most of the authors in the literature report F s values between 10 kHz and 500 kHz [40,[64][65][66][67][68][69][70][71][72] to provide a positive balance between power losses and converter size and cost. Therefore, this example considers F s = 50 kHz, which is common for Si-Mosfets.…”

Section: Design Examplementioning

confidence: 99%

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

et al. 2020

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In this paper, a design method for a photovoltaic system based on a dual active bridge converter and a photovoltaic module is proposed. The method is supported by analytical results and theoretical predictions, which are confirmed with circuital simulations. The analytical development, the theoretical predictions, and the validation through circuital simulations, are the main contributions of the paper. The dual active bridge converter is selected due to its high efficiency, high input and output voltages range, and high voltage-conversion ratio, which enables the interface of low-voltage photovoltaic modules with a high-voltage dc bus, such as the input of a micro-inverter. To propose the design method, the circuital analysis of the dual active bridge converter is performed to describe the general waveforms derived from the circuit behavior. Then, the analysis of the dual active bridge converter, interacting with a photovoltaic module driven by a maximum power point tracking algorithm, is used to establish the mathematical expressions for the leakage inductor current, the photovoltaic current, and the range of operation for the phase shift. The design method also provides analytical equations for both the high-frequency transformer equivalent leakage inductor and the photovoltaic side capacitor. The design method is validated through detailed circuital simulations of the whole photovoltaic system, which confirm that the maximum power of the photovoltaic module can be extracted with a correct design of the dual active bridge converter. Also, the theoretical restrictions of the photovoltaic system, such as the photovoltaic voltage and power ripples, are fulfilled with errors lower than 2% with respect to the circuital simulations. Finally, the simulation results also demonstrate that the maximum power point for different environmental conditions is reached, optimizing the phase shift factor with a maximum power point tracking algorithm.

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Section: Design Examplementioning

confidence: 99%

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

et al. 2020

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“…To improve the efficiency and power density of the SAB converter, soft-switching capabilities of this converter in its different conduction modes are analyzed in [6,13], and techniques to reduce switching and conduction losses are proposed in [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

An Overall Analysis of the Static Characteristics of the Single Active Bridge Converter

et al. 2022

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The dual active bridge (DAB) converter has been extensively analyzed and used in recent years for applications where bidirectional power flow is required. The unidirectional version of the DAB, which replaces the active output bridge with a diode bridge, has been called the single active bridge (SAB). The static behavior of the SAB differs markedly from similar DC/DC converters and can provide interesting advantages in certain applications. This paper presents a thorough study of the static behavior of the single active bridge (SAB) converter in different conduction modes. This study focuses on the description of the conduction modes, marking the main differences compared to similar DC/DC converters. Moreover, the SAB can be designed to operate in conduction mode for a given power level with different performance. A design guide is proposed, and the performance of different designs are compared, quantifying current stresses in the semiconductors. Finally, the main contribution of this paper is the identification of the similarities and differences between the SAB and the buck, forward, and phase-shifted full-bridge converters. It should be noted that the position of the inductor, either before or after the output rectifier bridge, modifies the voltage withstood by the output diodes and depends on the conduction mode, the voltage conversion ratio of the converter, and consequently, its main operation and performance. Moreover, the operation of the SAB is similar to a current source in all conduction modes, and it is not usual in similar converters. This peculiar behavior can be useful in certain applications. The theoretical study, the different designs, and the predicted operation of the SAB in different conduction modes have been validated using simulation and experimental results.

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Efficiency improvements in a Single Active Bridge modular DC-DC converter with snubber capacitance optimisation

Ting

Haan

Ferreira

2014

2014 International Power Electronics Conference (IPEC-Hiroshima 2014 - ECCE ASIA)

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Elimination of switching losses in the single active bridge over a wide voltage and load range at constant frequency

Cited by 5 publications

References 6 publications

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

An Overall Analysis of the Static Characteristics of the Single Active Bridge Converter

Efficiency improvements in a Single Active Bridge modular DC-DC converter with snubber capacitance optimisation

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